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  1. #include<stdio.h>
  2. #include<math.h>
  3. int tongchuso(int n){
  4. 	int sum=0;
  5. 	while(n!=0){
  6. 		sum=sum+n%10;
  7. 		n/=10;
  8. 	}
  9. 	return sum;
  10. }
  11. int nguyento(int n){
  12. 	if(n<2){
  13. 		return 0;
  14. 	}
  15. 	else{
  16. 		for(int i=2;i<=sqrt(n);i++){
  17. 			if(n%i==0){
  18. 				return 0;
  19. 			}
  20. 		}
  21.  
  22. 			return 1;
  23. 	}
  24.  
  25. }
  26. int main(){
  27. 	int a,b;
  28. 	scanf("%d %d",&a,&b);
  29. 	int dem=0;
  30. 	for(int i=a+1;i<=b;i++){
  31. 		if(nguyento(tongchuso(i))==1){
  32. 			dem++;
  33. 		}
  34. 	}
  35. 	printf("%d",dem);
  36.  
  37. }
Success #stdin #stdout 0.01s 5472KB
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https://ideone.com/BK2ddJ
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

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